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Inside the most sophisticated plan for solar geoengineering
Brief
Stardust CEO Yanai Yedvaab joined host Shayle Kann to walk through the company’s approach to solar radiation management (SRM), the technical tradeoffs compared with volcanic‑style sulfate injection, and the governance and ethical questions that follow. Yedvaab framed Stardust’s core innovation as two engineered particles — an amorphous silica variant and a silica core with a calcite shell — chosen because the materials are common, used in other industries, and designed to biodegrade rather than persist or bioaccumulate. He said the optical performance is similar to sulfates (within tens of percent), while the core‑shell particle reduces stratospheric infrared absorption, which could allow deeper cooling without the same heating side‑effects attributed to sulfate aerosols.
Yedvaab emphasized testing and monitoring as central differentiators. He argued that background stratospheric sulfate (he cited 'a few hundred thousand tons') makes small‑scale sulfate experiments impractical, whereas Stardust’s particles enable a stepwise, clinical‑trial style ramp‑up: start very small, collect observational data, and only scale after meeting safety criteria. He described a proprietary tagging/fingerprinting system to track each batch globally in real time and said Stardust has published eight papers outlining requirements, lab results, and a testing roadmap. Cost figures were explicit: ~ $10 billion per 1 million tons for ~0.5°C of cooling, meaning roughly $20 billion/year to stabilize current warming with ~2 million tons — numbers presented as modest relative to other climate interventions.
On governance and ethics, Yedvaab and Kann agreed governments must control R&D and any deployment; Stardust publicly commits not to deploy without multilateral government authorization and cites the Montreal Protocol as an illustrative precedent. Yedvaab acknowledged the moral‑hazard problem — the risk that SRM could reduce incentives to decarbonize — but argued that providing safe, regulated options is a moral imperative to protect future generations. He also explained why the work is organized as a private company (to aggregate resources and attract talent) while urging policy leadership, external validation, and broader academic and institutional participation over the next two to three years.
Why it matters
Host Shayle Kann noted a published estimate that dispersing ~3 million tons of reflective particles into the stratosphere could cool the planet by 1.5°C for roughly $30 billion (cited as a framing number for affordability and governance risk).
Key details
- Yanai Yedvaab (CEO & co‑founder, Stardust) described two proprietary particle designs: an amorphous silica particle and a core‑shell particle with an amorphous silica core and calcite shell; he said these materials are naturally occurring, used in other industries (including as food additives), and intended to be biodegradable to avoid long‑term bioaccumulation.
- Yedvaab told Shayle the Stardust particles have optical effectiveness roughly similar to sulfate aerosols (within 'a few tens of percent'), but the core‑shell design reduces stratospheric infrared absorption (the heating effect) and therefore can be scaled to higher cooling if needed.
- Stardust argues their particles enable staged, small‑scale testing (a 'clinical trial' ramp‑up), unlike sulfate: Yedvaab said stratospheric sulfate background is on the order of 'a few hundred thousand tons,' making truly small sulfate tests impractical, whereas Stardust's particles can be introduced at far lower, measurable levels.
- Yedvaab provided cost estimates: dispersing 1 million tons of Stardust particles would cost roughly $10 billion and yield ~0.5°C cooling; stabilizing current warming would require ~2 million tons (~$20 billion) annually — costs he framed as modest relative to other climate interventions.
- On risks, Yedvaab organized concerns into three buckets — human health/biosphere toxicity, stratospheric chemistry (ozone impacts), and climatic effects (precipitation, agriculture, carbon stores) — and said all must be addressed for policymakers to consider deployment; Stardust has released a series of eight papers and plans further testing.